Okubonakalayo kwe-GIS; Amathuluzi wokwakha nokuhlela

Sizokunikezela lokhu okuthunyelwe ukuze sibone amathuluzi okwakha nokuhlela idatha nge-Manifold, kulo mkhakha izixazululo ze-GIS zibuthakathaka kakhulu, ngenkathi kukhawulwa ukunemba "okungenamkhawulo" kwamathuluzi we-CAD kusukela lapho kugcinwa ku-database kudinga lokho khawula "ukucacisa" kwakho ezindaweni eziningi zamadesimali. Kusobala ukuthi ngezinjongo ezisebenzayo izingxenye ezimbili kwezishumi zanele ... futhi kwezinye izimo zibe zithathu.

Kepha ungalindela kusuka kuthuluzi elinezixazululo eziphansi zokwakha nokuguqula amajometri. Ake sibone ukuthi inakho:

1. Amathuluzi endalo

Lezi zenziwa ngokuzenzakalelayo lapho ukhetha isakhi, futhi okulandelayo:

Kususelwa ekwakhiweni kwezinhlobo ezintathu zezinto: izindawo (polygon), imigqa kanye namaphoyinti; ngokwahluka kwe-ESRI kokuthi isakhi singathwala izinhlobo ezahlukene zezinto kuleyo naleyo isigaba sesici kungaba kuphela uhlobo olulodwa lwalezi zinto ezintathu.

Bese kuba nokuhlukahluka kwendalo okuhamba ngale ndlela:

• Faka indawo (kususelwa kumaphoyinti), alingana nomngcele we-AutocAD noma umumo we-Microstation
• Faka indawo yamahhala
• Faka umugqa wamahhala
• Faka umugqa (kususelwa kumaphoyinti)
• Faka imigqa engafakwanga, elingana nomugqa we-AutoCAD ne-Microstation smartline ngaphandle kwenketho yokuhlela iqembu
• Faka amaphuzu
• Faka ibhokisi
• Faka ibhokisi esekelwe esikhungweni
• Faka umbuthano
• Faka umbuthano osuselwa esikhungweni
• Faka i-ellipse
• Faka i-ellipse esekelwe esikhungweni
• Faka indingilizi ngokususelwe kudatha (maphakathi, irediyasi). Lokhu okwedlule kuyasebenza kakhulu ku-GIS ngoba kusetshenziswa kakhulu ukukala kusuka ku-vertex noma ku-triangulation ... yize kusilela ngoba ayikho enye indlela yokuhlangana ezimpophweni.

Okungeziwe kulokhu ipaneli lokungena ledatha ngekhibhodi engiyikhombisile kuyo okuthunyelwe kwangaphambilini esebenza nge inkinobho ethi "faka" kukhibhodi.

I-2. Amathuluzi we-Snap.

Usucishe wanele, futhi phakathi kokuhle kakhulu abanakho inketho yokukhetha abaningana ngasikhathi sinye ... isici esilinganiselwe ku-Microstation. Ukuze usebenzise noma usebenze ukuzama (ukuqaqa) sebenzisa i- "ibha yesikhala"yekhibhodi.

• Isifinyezo grid (izinwebuli nobude), uma igridi isebenze, ikuvumela ukuthi uthwebule njengendawo okwenzeka kuyo ukubekeka kwemigwaqo ye-mesh.
• Snap eya egridi (xy izixhumanisi), efana neyaphambilini.
• Yeqa kancane kuma-polygons
• Yeqa emigqeni
• Snap kumaphoyinti
• Pheqa ezintweni, lokhu kulingana ne-AutoCAD "eseduze," lapho iphuzu libanjwa onqenqemeni lwe-polygon noma umugqa.
• Pheqa ekukhetheni, lo ngomunye wemiyalo engcono kakhulu, ngoba ikuvumela ukuthi ungatatazeli kuphela ezintweni ezikhethiwe, uvumela inhlanganisela yalokhu okungenhla.

Kuyacaca, ukuthi enye indlela "yokuhlangana", "i-midpoint" kanye ne "Centerpoint" idingeka kakhulu, i-tangent ayibonakali idingeka kangako e-GIS, futhi "i-quadrant"

3. Amathuluzi wokuhlela

• Faka i-vertex
• Faka i-vertex kulayini
• Susa i-vertex
• Khipha i-vertex futhi ungahlanganisi iziphetho
• Sika isigaba
• Susa isigaba
• Nweba
• Yinqunyiwe (i-trim)
• Ingxenye yezinto

Kudingeka amathuluzi amaningi, njengokuhamba ngokunemba, parallel (offset) ...

4. Ukulawulwa kwengqondo

Lena ithuluzi le- Ngake ngakhuluma ngaphambili, evumela izinto ukuthi zihlobanise inqubo yendawo; ukuze kuthi lapho kushintshwa umngcele omakhelwane bajwayela kulolo shintsho. 

Lokhu kwaba okukodwa kokunciphisa okukhulu kwezinguqulo zangaphambilini ze-ArcView 3x; I-ArcGIS 9x ivele ihlanganisa lokhu nakuba kubonakala kimi ukuthi kuphela uma isigaba sesici ingaphakathi kwe I-Geodatabasekanye Bentley Map ne-Bentley Cadastre.

Kukhona nesixazululo esibizwa nge- "topology factory" esikuvumela ukuba wenze ukuhlanza okukhulu kakhulu kwe-topological, phakathi kwemigqa eyeqile, izinto ezigqagqene, ama-geometri akhululekile kanye nenketho yokuzixazulula ngesandla noma ngokuzenzekelayo. kuse- "drawing / topolgy factory"

Ekuphetheni, ngenkathi i-Manifold ingangezi amathuluzi ambalwa angeziwe, kungakuhle ukwenza ukuhlela ngethuluzi le-CAD, futhi ulethe kuphela ukuma noma amaphuzu ku-GIS ukwakha lapho. Kulokhu, ukukhetha kwe I-GvSIG ukuzama ukulingisa amathuluzi wokwakha abaluleke kakhulu e-AutoCAD esikhundleni sokuthatha ukuthi abasebenzisi bahlala.